I would say you are correct. With the 150 gr. muzzleloader and different bullet designs, I would say the muzzleloader's are on par with the cartridges you mentioned.
As a side note:
I have been lobbing the Delaware DNR about the use of straight wall cartridges for deer season in conjunction with the shotgun season. With some of today's shotgun slugs, the range is getting close to the 45-70 and such.